Classification
616 - Diseases
239
005 - Computer programming, programs & data
164
620 - Engineering & allied operations
125
330 - Economics
121
006 - Special computer methods
116
004 - Data processing & computer science
113
617 - Surgery & related medical specialties
110
333 - Economics of land & energy
71
621 - Applied physics
64
658 - General management
64
304 - Factors affecting social behavior
61
519 - Probabilities & applied mathematics
51
612 - Human physiology
51
338 - Production
48
363 - Other social problems & services
44
530 - Physics
44
551 - Geology, hydrology & meteorology
43
610 - Medicine & health
43
571 - Physiology & related subjects
42
500 - Natural sciences & mathematics
41
900 - History & geography
37
577 - Ecology
35
515 - Analysis
33
572 - Biochemistry
33
331 - Labor economics
26
541 - Physical chemistry
24
910 - Geography & travel
24
300 - Social sciences
22
301 - Sociology & anthropology
22
516 - Geometry
21
629 - Other branches of engineering
21
320 - Political science
20
547 - Organic chemistry
19
570 - Life sciences; biology
19
615 - Pharmacology & therapeutics
19
700 - The arts; fine & decorative arts
19
550 - Earth sciences
17
590 - Animals (Zoology)
17
003 - Systems
16
306 - Culture & institutions
15
600 - Technology
15
745 - Decorative arts
15
670 - Manufacturing
14
307 - Communities
13
510 - Mathematics
13
512 - Algebra
13
539 - Modern physics
13
332 - Financial economics
12
337 - International economics
12
520 - Astronomy & allied sciences
12
more ...